Also, as suggested by a reader of this blog, here are some comments about this problem made back in 1914 by Pope Benedict XV in his encyclical Ad Beatissimi Apostolorum. They seem quite apropos:

As regards matters in which without harm to faith or discipline — in the absence of any authoritative intervention of the Apostolic See — there is room for divergent opinions, it is clearly the right of everyone to express and defend his own opinion. But in such discussions no expressions should be used which might constitute serious breaches of charity; let each one freely defend his own opinion, but let it be done with due moderation, so that no one should consider himself entitled to affix on those who merely do not agree with his ideas the stigma of disloyalty to faith or to discipline.

It is, moreover, Our will that Catholics should abstain from certain appellations which have recently been brought into use to distinguish one group of Catholics from another. They are to be avoided not only as "profane novelties of words," out of harmony with both truth and justice, but also because they give rise to great trouble and confusion among Catholics. Such is the nature of Catholicism that it does not admit of more or less, but must be held as a whole or as a whole rejected: "This is the Catholic faith, which unless a man believe faithfully and firmly; he cannot be saved" (Athanassian Creed). There is no need of adding any qualifying terms to the profession of Catholicism: it is quite enough for each one to proclaim "Christian is my name and Catholic my surname," only let him endeavour to be in reality what he calls himself. . . . (continue reading)